title: Resonant THz sensor for paper quality monitoring using THz fiber Bragg gratings.
abstract: We report fabrication of THz fiber Bragg gratings (TFBG) using CO(2) laser inscription on subwavelength step-index polymer fibers. A fiber Bragg grating with 48 periods features a ~4 GHz-wide stop band and ~15 dB transmission loss in the middle of a stop band. The potential of such gratings in the design of resonant sensors for the monitoring of paper quality is demonstrated. Experimental spectral sensitivity of the TFBG-based paper thickness sensor was found to be ~-0.67 GHz/10 μm. A 3D electromagnetic model of a Bragg grating was used to explain experimental findings.
authors.affiliation: Department of Engineering Physics, Ecole Polytechnique de Montréal, Québec, Canada.
authors.forename: Guofeng
authors.initials: G
authors.lastname: Yan
authors.forename: Andrey
authors.initials: A
authors.lastname: Markov
authors.forename: Yasser
authors.initials: Y
authors.lastname: Chinifooroshan
authors.forename: Saurabh M
authors.initials: SM
authors.lastname: Tripathi
authors.forename: Wojtek J
authors.initials: WJ
authors.lastname: Bock
authors.forename: Maksim
authors.initials: M
authors.lastname: Skorobogatiy